These liners are certified as compostable according to EN 13432. We recommend that you remove liner from your caddy every 3-4 days. The liner and its contents should be disposed of at an authorised compost collection scheme or in a home compost system. Please refer to your local authority guidelines for the use of compostable bags. 4 Litres. IW2 Liners 4L 100% Compostable. Fits IntelligentWaste Food Waste Caddy. Pack of 50.